Remove designateclient mock from recordset tests
Remove designateclient mock from recordset tests

Designate client mock is replaced by requests_mocks

Change-Id: I839a4d83bb53214980fd87beb79454251335721b

dtroyer/python-openstacksdk,openstack-infra/shade,dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk